查询词典 radon

We present the forward and inverse transform formulas and discuss how to choose the best parameters to avoid aliasing.

讨论了多项式正反Radon变换的公式、实现方法和有关计算参数的选择。

It is calculated according as the quantity of air molecules ionized by the alpha rays decayed by radon and its progeny as the air is inhaled to the ionization chamber by the air pump.

采用的测量原理是通过气泵把空气吸入电离室内，通过测量氡及其子体衰变放出α射线使空气分子电离的量来间接测量空气中的氡浓度。

A radon proof hydrous paint could well avoid the perniciousness of radon. The results of experiment and ...

本文分析了试验结果，探讨了防氡涂料的机理。

Radon in the environment ; hazard ; radiation ; source of radon ; control measure

环境氡；危害；辐射；氡的来源；控制措施

Issues like what kind of subsequent electric circuit should be adopted to produce effectively the spectrum measure data and the gross measure data, and how to conduct the measure of the radon chamber temperature and humidity in a convenient and accurate way, are one of the important aspects of investigation of radon chamber dada acquisition systems.

在氡室中，通过金硅面垒半体探测器对α粒子的测量，采用怎样的后续电路结构才能有效的获取谱测量数据与总量测量数据，以及对氡室环境的温、湿度如何能简捷、准确测量是氡室数据采集系统的重要研究课题之一。

The SD-3A Auto-radon detector is a kind of digital,sensible and stable instrument which can automaticaly measure gas radon under various conditions.

SD-3A自动测氡仪是"九五"中国地震局监测司指导下研制的数字化、高灵敏度、性能稳定的、适用多种环境下的连续自动观测气氡的仪器。

Chen rui1,zhou shu-min2(east china institute of technology, 344000 fuzhou, china)abstract: radon chamber is a standard equipment which demarcates radon measure instrument. this paper introduces a high- speed data acquisition card called pci- 8408 based on pci bus, and data collection is controlled automatically by device driver using mcgs.

氡室作为刻度测氡仪器的一种标准装置有着重要的应用，本文利用pci-8408光隔离开关量输入输出接口卡作为数据采集接口，根据采集数据对氡室气路进行控制，并通过mcgs组态软件以设备驱动程序的方式控制继电器的状态，实现氡的自动补给和排放以及氡室内温湿度的智能控制。

This paper briefly reviews the research history of the lung cancer due to Radon and its progenies in the past hundreds years,then presents the relationship between risk of lung cancer and radon and its progenies inbreathed by uranium miners.

简要回顾氡致肺癌的长时间认识过程和研究历史，简述了当年铀矿工人和矿工吸入氡及其子体与肺癌发病率的关系，指出环境中氡的危害。

The element we're interested in is Radon-222 (there is another form, Radon-218, but the half-life of this isotope is only a few hundredths of a second, so it is less of a problem).

元素我们感兴趣的是氡- 222 （还有另一种形式，氡- 218 ，但半衰期同位素这是只有少数几个百分之一秒，所以它不是一个问题）。

Due to the hazards of radon and its progenies to public health and the important uses of radon measurements in earthquake forecast etc, the measurement accuracy causes more and more attention.

由于氡及其子体对人体健康的影响和氡测量在地震预报等各个方面的重要作用，测氡的准确性越来越引起重视。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。